Electricians use a tool known as fish tape to pull wires through conduits in
the wall. Sometimes the fish tape gets dead stopped in the wall. I need a
(simple, cheap) device to determine where exactly in the wall the head of a
fish tape is stuck. Is it possible to use any readily available device for
this, or if not, what principle of work can you suggest for such a thing?
Generally there is not much room there in the conduit; the fish tape itself
is some 6-8 mm in diameter usually made of a dialectical material. I think
of two coils: one in operator=92s hands and another one (short-circuited)  -
in the head of the fish tape. The impedance of the first one will depend on
proximity to the other. Does this have any chances to work?
Any thoughts will be highly appreciable. Thanks.

Arkady

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